Take the following telephone conversation;
Sally: What is your postcode?
Tim: SC34 1BJ
Sally: Start again, F?
Tim: No, S?
Sally: OK, SP?
Tim: No, SC
Sally: ST?
Does it seem familiar? When spelling something out loud using an audio device, such as a phone or a microphone, it can be very difficult to understand which letters are being said. This is because so many letters sound the same in the English alphabet. Add to this the bad sound quality and the inability to read the lips and it can take a while to spell something out loud correctly.
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